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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script src="./common.js"></script>
    <script>
        // document.querySelector()
        // dom.属性名
        // dom.属性名  = '22'
        // dom.value = 'aa'
        // dom.setAttribute()
        // dom.getAttribute()
        // dom.removeAttribute()
        // dom.style.color  = 'red'
        // push pop unshift shift  splice concat join indexOf includes
        // sort  slice
        // forEach map some every find findIndex filter  flat reduce 
    </script>

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